simplebar/dist/simplebar-core.esm.js

/**
 * SimpleBar.js - v5.2.1
 * Scrollbars, simpler.
 * https://grsmto.github.io/simplebar/
 *
 * Made by Adrien Denat from a fork by Jonathan Nicol
 * Under MIT License
 */

import 'core-js/modules/es.array.filter';
import 'core-js/modules/es.array.for-each';
import 'core-js/modules/es.array.iterator';
import 'core-js/modules/es.object.assign';
import 'core-js/modules/es.object.to-string';
import 'core-js/modules/es.parse-int';
import 'core-js/modules/es.string.iterator';
import 'core-js/modules/es.weak-map';
import 'core-js/modules/web.dom-collections.iterator';
import throttle from 'lodash.throttle';
import debounce from 'lodash.debounce';
import memoize from 'lodash.memoize';
import ResizeObserver from 'resize-observer-polyfill';
import canUseDOM from 'can-use-dom';
import 'core-js/modules/es.array.reduce';
import 'core-js/modules/es.function.name';
import 'core-js/modules/es.regexp.exec';
import 'core-js/modules/es.string.match';
import 'core-js/modules/es.string.replace';

var cachedScrollbarWidth = null;
var cachedDevicePixelRatio = null;

if (canUseDOM) {
  window.addEventListener('resize', function () {
    if (cachedDevicePixelRatio !== window.devicePixelRatio) {
      cachedDevicePixelRatio = window.devicePixelRatio;
      cachedScrollbarWidth = null;
    }
  });
}

function scrollbarWidth() {
  if (cachedScrollbarWidth === null) {
    if (typeof document === 'undefined') {
      cachedScrollbarWidth = 0;
      return cachedScrollbarWidth;
    }

    var body = document.body;
    var box = document.createElement('div');
    box.classList.add('simplebar-hide-scrollbar');
    body.appendChild(box);
    var width = box.getBoundingClientRect().right;
    body.removeChild(box);
    cachedScrollbarWidth = width;
  }

  return cachedScrollbarWidth;
}

function getElementWindow(element) {
  if (!element || !element.ownerDocument || !element.ownerDocument.defaultView) {
    return window;
  }

  return element.ownerDocument.defaultView;
}
function getElementDocument(element) {
  if (!element || !element.ownerDocument) {
    return document;
  }

  return element.ownerDocument;
}

var SimpleBar =
/*#__PURE__*/
function () {
  function SimpleBar(element, options) {
    var _this = this;

    this.onScroll = function () {
      var elWindow = getElementWindow(_this.el);

      if (!_this.scrollXTicking) {
        elWindow.requestAnimationFrame(_this.scrollX);
        _this.scrollXTicking = true;
      }

      if (!_this.scrollYTicking) {
        elWindow.requestAnimationFrame(_this.scrollY);
        _this.scrollYTicking = true;
      }
    };

    this.scrollX = function () {
      if (_this.axis.x.isOverflowing) {
        _this.showScrollbar('x');

        _this.positionScrollbar('x');
      }

      _this.scrollXTicking = false;
    };

    this.scrollY = function () {
      if (_this.axis.y.isOverflowing) {
        _this.showScrollbar('y');

        _this.positionScrollbar('y');
      }

      _this.scrollYTicking = false;
    };

    this.onMouseEnter = function () {
      _this.showScrollbar('x');

      _this.showScrollbar('y');
    };

    this.onMouseMove = function (e) {
      _this.mouseX = e.clientX;
      _this.mouseY = e.clientY;

      if (_this.axis.x.isOverflowing || _this.axis.x.forceVisible) {
        _this.onMouseMoveForAxis('x');
      }

      if (_this.axis.y.isOverflowing || _this.axis.y.forceVisible) {
        _this.onMouseMoveForAxis('y');
      }
    };

    this.onMouseLeave = function () {
      _this.onMouseMove.cancel();

      if (_this.axis.x.isOverflowing || _this.axis.x.forceVisible) {
        _this.onMouseLeaveForAxis('x');
      }

      if (_this.axis.y.isOverflowing || _this.axis.y.forceVisible) {
        _this.onMouseLeaveForAxis('y');
      }

      _this.mouseX = -1;
      _this.mouseY = -1;
    };

    this.onWindowResize = function () {
      // Recalculate scrollbarWidth in case it's a zoom
      _this.scrollbarWidth = _this.getScrollbarWidth();

      _this.hideNativeScrollbar();
    };

    this.hideScrollbars = function () {
      _this.axis.x.track.rect = _this.axis.x.track.el.getBoundingClientRect();
      _this.axis.y.track.rect = _this.axis.y.track.el.getBoundingClientRect();

      if (!_this.isWithinBounds(_this.axis.y.track.rect)) {
        _this.axis.y.scrollbar.el.classList.remove(_this.classNames.visible);

        _this.axis.y.isVisible = false;
      }

      if (!_this.isWithinBounds(_this.axis.x.track.rect)) {
        _this.axis.x.scrollbar.el.classList.remove(_this.classNames.visible);

        _this.axis.x.isVisible = false;
      }
    };

    this.onPointerEvent = function (e) {
      var isWithinTrackXBounds, isWithinTrackYBounds;
      _this.axis.x.track.rect = _this.axis.x.track.el.getBoundingClientRect();
      _this.axis.y.track.rect = _this.axis.y.track.el.getBoundingClientRect();

      if (_this.axis.x.isOverflowing || _this.axis.x.forceVisible) {
        isWithinTrackXBounds = _this.isWithinBounds(_this.axis.x.track.rect);
      }

      if (_this.axis.y.isOverflowing || _this.axis.y.forceVisible) {
        isWithinTrackYBounds = _this.isWithinBounds(_this.axis.y.track.rect);
      } // If any pointer event is called on the scrollbar


      if (isWithinTrackXBounds || isWithinTrackYBounds) {
        // Preventing the event's default action stops text being
        // selectable during the drag.
        e.preventDefault(); // Prevent event leaking

        e.stopPropagation();

        if (e.type === 'mousedown') {
          if (isWithinTrackXBounds) {
            _this.axis.x.scrollbar.rect = _this.axis.x.scrollbar.el.getBoundingClientRect();

            if (_this.isWithinBounds(_this.axis.x.scrollbar.rect)) {
              _this.onDragStart(e, 'x');
            } else {
              _this.onTrackClick(e, 'x');
            }
          }

          if (isWithinTrackYBounds) {
            _this.axis.y.scrollbar.rect = _this.axis.y.scrollbar.el.getBoundingClientRect();

            if (_this.isWithinBounds(_this.axis.y.scrollbar.rect)) {
              _this.onDragStart(e, 'y');
            } else {
              _this.onTrackClick(e, 'y');
            }
          }
        }
      }
    };

    this.drag = function (e) {
      var eventOffset;
      var track = _this.axis[_this.draggedAxis].track;
      var trackSize = track.rect[_this.axis[_this.draggedAxis].sizeAttr];
      var scrollbar = _this.axis[_this.draggedAxis].scrollbar;
      var contentSize = _this.contentWrapperEl[_this.axis[_this.draggedAxis].scrollSizeAttr];
      var hostSize = parseInt(_this.elStyles[_this.axis[_this.draggedAxis].sizeAttr], 10);
      e.preventDefault();
      e.stopPropagation();

      if (_this.draggedAxis === 'y') {
        eventOffset = e.pageY;
      } else {
        eventOffset = e.pageX;
      } // Calculate how far the user's mouse is from the top/left of the scrollbar (minus the dragOffset).


      var dragPos = eventOffset - track.rect[_this.axis[_this.draggedAxis].offsetAttr] - _this.axis[_this.draggedAxis].dragOffset; // Convert the mouse position into a percentage of the scrollbar height/width.

      var dragPerc = dragPos / (trackSize - scrollbar.size); // Scroll the content by the same percentage.

      var scrollPos = dragPerc * (contentSize - hostSize); // Fix browsers inconsistency on RTL

      if (_this.draggedAxis === 'x') {
        scrollPos = _this.isRtl && SimpleBar.getRtlHelpers().isRtlScrollbarInverted ? scrollPos - (trackSize + scrollbar.size) : scrollPos;
        scrollPos = _this.isRtl && SimpleBar.getRtlHelpers().isRtlScrollingInverted ? -scrollPos : scrollPos;
      }

      _this.contentWrapperEl[_this.axis[_this.draggedAxis].scrollOffsetAttr] = scrollPos;
    };

    this.onEndDrag = function (e) {
      var elDocument = getElementDocument(_this.el);
      var elWindow = getElementWindow(_this.el);
      e.preventDefault();
      e.stopPropagation();

      _this.el.classList.remove(_this.classNames.dragging);

      elDocument.removeEventListener('mousemove', _this.drag, true);
      elDocument.removeEventListener('mouseup', _this.onEndDrag, true);
      _this.removePreventClickId = elWindow.setTimeout(function () {
        // Remove these asynchronously so we still suppress click events
        // generated simultaneously with mouseup.
        elDocument.removeEventListener('click', _this.preventClick, true);
        elDocument.removeEventListener('dblclick', _this.preventClick, true);
        _this.removePreventClickId = null;
      });
    };

    this.preventClick = function (e) {
      e.preventDefault();
      e.stopPropagation();
    };

    this.el = element;
    this.minScrollbarWidth = 20;
    this.options = Object.assign({}, SimpleBar.defaultOptions, {}, options);
    this.classNames = Object.assign({}, SimpleBar.defaultOptions.classNames, {}, this.options.classNames);
    this.axis = {
      x: {
        scrollOffsetAttr: 'scrollLeft',
        sizeAttr: 'width',
        scrollSizeAttr: 'scrollWidth',
        offsetSizeAttr: 'offsetWidth',
        offsetAttr: 'left',
        overflowAttr: 'overflowX',
        dragOffset: 0,
        isOverflowing: true,
        isVisible: false,
        forceVisible: false,
        track: {},
        scrollbar: {}
      },
      y: {
        scrollOffsetAttr: 'scrollTop',
        sizeAttr: 'height',
        scrollSizeAttr: 'scrollHeight',
        offsetSizeAttr: 'offsetHeight',
        offsetAttr: 'top',
        overflowAttr: 'overflowY',
        dragOffset: 0,
        isOverflowing: true,
        isVisible: false,
        forceVisible: false,
        track: {},
        scrollbar: {}
      }
    };
    this.removePreventClickId = null; // Don't re-instantiate over an existing one

    if (SimpleBar.instances.has(this.el)) {
      return;
    }

    this.recalculate = throttle(this.recalculate.bind(this), 64);
    this.onMouseMove = throttle(this.onMouseMove.bind(this), 64);
    this.hideScrollbars = debounce(this.hideScrollbars.bind(this), this.options.timeout);
    this.onWindowResize = debounce(this.onWindowResize.bind(this), 64, {
      leading: true
    });
    SimpleBar.getRtlHelpers = memoize(SimpleBar.getRtlHelpers);
    this.init();
  }
  /**
   * Static properties
   */

  /**
   * Helper to fix browsers inconsistency on RTL:
   *  - Firefox inverts the scrollbar initial position
   *  - IE11 inverts both scrollbar position and scrolling offset
   * Directly inspired by @KingSora's OverlayScrollbars https://github.com/KingSora/OverlayScrollbars/blob/master/js/OverlayScrollbars.js#L1634
   */


  SimpleBar.getRtlHelpers = function getRtlHelpers() {
    var dummyDiv = document.createElement('div');
    dummyDiv.innerHTML = '<div class="hs-dummy-scrollbar-size"><div style="height: 200%; width: 200%; margin: 10px 0;"></div></div>';
    var scrollbarDummyEl = dummyDiv.firstElementChild;
    document.body.appendChild(scrollbarDummyEl);
    var dummyContainerChild = scrollbarDummyEl.firstElementChild;
    scrollbarDummyEl.scrollLeft = 0;
    var dummyContainerOffset = SimpleBar.getOffset(scrollbarDummyEl);
    var dummyContainerChildOffset = SimpleBar.getOffset(dummyContainerChild);
    scrollbarDummyEl.scrollLeft = 999;
    var dummyContainerScrollOffsetAfterScroll = SimpleBar.getOffset(dummyContainerChild);
    return {
      // determines if the scrolling is responding with negative values
      isRtlScrollingInverted: dummyContainerOffset.left !== dummyContainerChildOffset.left && dummyContainerChildOffset.left - dummyContainerScrollOffsetAfterScroll.left !== 0,
      // determines if the origin scrollbar position is inverted or not (positioned on left or right)
      isRtlScrollbarInverted: dummyContainerOffset.left !== dummyContainerChildOffset.left
    };
  };

  SimpleBar.getOffset = function getOffset(el) {
    var rect = el.getBoundingClientRect();
    var elDocument = getElementDocument(el);
    var elWindow = getElementWindow(el);
    return {
      top: rect.top + (elWindow.pageYOffset || elDocument.documentElement.scrollTop),
      left: rect.left + (elWindow.pageXOffset || elDocument.documentElement.scrollLeft)
    };
  };

  var _proto = SimpleBar.prototype;

  _proto.init = function init() {
    // Save a reference to the instance, so we know this DOM node has already been instancied
    SimpleBar.instances.set(this.el, this); // We stop here on server-side

    if (canUseDOM) {
      this.initDOM();
      this.scrollbarWidth = this.getScrollbarWidth();
      this.recalculate();
      this.initListeners();
    }
  };

  _proto.initDOM = function initDOM() {
    var _this2 = this;

    // make sure this element doesn't have the elements yet
    if (Array.prototype.filter.call(this.el.children, function (child) {
      return child.classList.contains(_this2.classNames.wrapper);
    }).length) {
      // assume that element has his DOM already initiated
      this.wrapperEl = this.el.querySelector("." + this.classNames.wrapper);
      this.contentWrapperEl = this.options.scrollableNode || this.el.querySelector("." + this.classNames.contentWrapper);
      this.contentEl = this.options.contentNode || this.el.querySelector("." + this.classNames.contentEl);
      this.offsetEl = this.el.querySelector("." + this.classNames.offset);
      this.maskEl = this.el.querySelector("." + this.classNames.mask);
      this.placeholderEl = this.findChild(this.wrapperEl, "." + this.classNames.placeholder);
      this.heightAutoObserverWrapperEl = this.el.querySelector("." + this.classNames.heightAutoObserverWrapperEl);
      this.heightAutoObserverEl = this.el.querySelector("." + this.classNames.heightAutoObserverEl);
      this.axis.x.track.el = this.findChild(this.el, "." + this.classNames.track + "." + this.classNames.horizontal);
      this.axis.y.track.el = this.findChild(this.el, "." + this.classNames.track + "." + this.classNames.vertical);
    } else {
      // Prepare DOM
      this.wrapperEl = document.createElement('div');
      this.contentWrapperEl = document.createElement('div');
      this.offsetEl = document.createElement('div');
      this.maskEl = document.createElement('div');
      this.contentEl = document.createElement('div');
      this.placeholderEl = document.createElement('div');
      this.heightAutoObserverWrapperEl = document.createElement('div');
      this.heightAutoObserverEl = document.createElement('div');
      this.wrapperEl.classList.add(this.classNames.wrapper);
      this.contentWrapperEl.classList.add(this.classNames.contentWrapper);
      this.offsetEl.classList.add(this.classNames.offset);
      this.maskEl.classList.add(this.classNames.mask);
      this.contentEl.classList.add(this.classNames.contentEl);
      this.placeholderEl.classList.add(this.classNames.placeholder);
      this.heightAutoObserverWrapperEl.classList.add(this.classNames.heightAutoObserverWrapperEl);
      this.heightAutoObserverEl.classList.add(this.classNames.heightAutoObserverEl);

      while (this.el.firstChild) {
        this.contentEl.appendChild(this.el.firstChild);
      }

      this.contentWrapperEl.appendChild(this.contentEl);
      this.offsetEl.appendChild(this.contentWrapperEl);
      this.maskEl.appendChild(this.offsetEl);
      this.heightAutoObserverWrapperEl.appendChild(this.heightAutoObserverEl);
      this.wrapperEl.appendChild(this.heightAutoObserverWrapperEl);
      this.wrapperEl.appendChild(this.maskEl);
      this.wrapperEl.appendChild(this.placeholderEl);
      this.el.appendChild(this.wrapperEl);
    }

    if (!this.axis.x.track.el || !this.axis.y.track.el) {
      var track = document.createElement('div');
      var scrollbar = document.createElement('div');
      track.classList.add(this.classNames.track);
      scrollbar.classList.add(this.classNames.scrollbar);
      track.appendChild(scrollbar);
      this.axis.x.track.el = track.cloneNode(true);
      this.axis.x.track.el.classList.add(this.classNames.horizontal);
      this.axis.y.track.el = track.cloneNode(true);
      this.axis.y.track.el.classList.add(this.classNames.vertical);
      this.el.appendChild(this.axis.x.track.el);
      this.el.appendChild(this.axis.y.track.el);
    }

    this.axis.x.scrollbar.el = this.axis.x.track.el.querySelector("." + this.classNames.scrollbar);
    this.axis.y.scrollbar.el = this.axis.y.track.el.querySelector("." + this.classNames.scrollbar);

    if (!this.options.autoHide) {
      this.axis.x.scrollbar.el.classList.add(this.classNames.visible);
      this.axis.y.scrollbar.el.classList.add(this.classNames.visible);
    }

    this.el.setAttribute('data-simplebar', 'init');
  };

  _proto.initListeners = function initListeners() {
    var _this3 = this;

    var elWindow = getElementWindow(this.el); // Event listeners

    if (this.options.autoHide) {
      this.el.addEventListener('mouseenter', this.onMouseEnter);
    }

    ['mousedown', 'click', 'dblclick'].forEach(function (e) {
      _this3.el.addEventListener(e, _this3.onPointerEvent, true);
    });
    ['touchstart', 'touchend', 'touchmove'].forEach(function (e) {
      _this3.el.addEventListener(e, _this3.onPointerEvent, {
        capture: true,
        passive: true
      });
    });
    this.el.addEventListener('mousemove', this.onMouseMove);
    this.el.addEventListener('mouseleave', this.onMouseLeave);
    this.contentWrapperEl.addEventListener('scroll', this.onScroll); // Browser zoom triggers a window resize

    elWindow.addEventListener('resize', this.onWindowResize); // Hack for https://github.com/WICG/ResizeObserver/issues/38

    var resizeObserverStarted = false;
    var resizeObserver = elWindow.ResizeObserver || ResizeObserver;
    this.resizeObserver = new resizeObserver(function () {
      if (!resizeObserverStarted) return;

      _this3.recalculate();
    });
    this.resizeObserver.observe(this.el);
    this.resizeObserver.observe(this.contentEl);
    elWindow.requestAnimationFrame(function () {
      resizeObserverStarted = true;
    }); // This is required to detect horizontal scroll. Vertical scroll only needs the resizeObserver.

    this.mutationObserver = new elWindow.MutationObserver(this.recalculate);
    this.mutationObserver.observe(this.contentEl, {
      childList: true,
      subtree: true,
      characterData: true
    });
  };

  _proto.recalculate = function recalculate() {
    var elWindow = getElementWindow(this.el);
    this.elStyles = elWindow.getComputedStyle(this.el);
    this.isRtl = this.elStyles.direction === 'rtl';
    var contentElOffsetWidth = this.contentEl.offsetWidth;
    var isHeightAuto = this.heightAutoObserverEl.offsetHeight <= 1;
    var isWidthAuto = this.heightAutoObserverEl.offsetWidth <= 1 || contentElOffsetWidth > 0;
    var contentWrapperElOffsetWidth = this.contentWrapperEl.offsetWidth;
    var elOverflowX = this.elStyles.overflowX;
    var elOverflowY = this.elStyles.overflowY;
    this.contentEl.style.padding = this.elStyles.paddingTop + " " + this.elStyles.paddingRight + " " + this.elStyles.paddingBottom + " " + this.elStyles.paddingLeft;
    this.wrapperEl.style.margin = "-" + this.elStyles.paddingTop + " -" + this.elStyles.paddingRight + " -" + this.elStyles.paddingBottom + " -" + this.elStyles.paddingLeft;
    var contentElScrollHeight = this.contentEl.scrollHeight;
    var contentElScrollWidth = this.contentEl.scrollWidth;
    this.contentWrapperEl.style.height = isHeightAuto ? 'auto' : '100%'; // Determine placeholder size

    this.placeholderEl.style.width = isWidthAuto ? (contentElOffsetWidth || contentElScrollWidth) + "px" : 'auto';
    this.placeholderEl.style.height = contentElScrollHeight + "px";
    var contentWrapperElOffsetHeight = this.contentWrapperEl.offsetHeight;
    this.axis.x.isOverflowing = contentElOffsetWidth !== 0 && contentElScrollWidth > contentElOffsetWidth;
    this.axis.y.isOverflowing = contentElScrollHeight > contentWrapperElOffsetHeight; // Set isOverflowing to false if user explicitely set hidden overflow

    this.axis.x.isOverflowing = elOverflowX === 'hidden' ? false : this.axis.x.isOverflowing;
    this.axis.y.isOverflowing = elOverflowY === 'hidden' ? false : this.axis.y.isOverflowing;
    this.axis.x.forceVisible = this.options.forceVisible === 'x' || this.options.forceVisible === true;
    this.axis.y.forceVisible = this.options.forceVisible === 'y' || this.options.forceVisible === true;
    this.hideNativeScrollbar(); // Set isOverflowing to false if scrollbar is not necessary (content is shorter than offset)

    var offsetForXScrollbar = this.axis.x.isOverflowing ? this.scrollbarWidth : 0;
    var offsetForYScrollbar = this.axis.y.isOverflowing ? this.scrollbarWidth : 0;
    this.axis.x.isOverflowing = this.axis.x.isOverflowing && contentElScrollWidth > contentWrapperElOffsetWidth - offsetForYScrollbar;
    this.axis.y.isOverflowing = this.axis.y.isOverflowing && contentElScrollHeight > contentWrapperElOffsetHeight - offsetForXScrollbar;
    this.axis.x.scrollbar.size = this.getScrollbarSize('x');
    this.axis.y.scrollbar.size = this.getScrollbarSize('y');
    this.axis.x.scrollbar.el.style.width = this.axis.x.scrollbar.size + "px";
    this.axis.y.scrollbar.el.style.height = this.axis.y.scrollbar.size + "px";
    this.positionScrollbar('x');
    this.positionScrollbar('y');
    this.toggleTrackVisibility('x');
    this.toggleTrackVisibility('y');
  }
  /**
   * Calculate scrollbar size
   */
  ;

  _proto.getScrollbarSize = function getScrollbarSize(axis) {
    if (axis === void 0) {
      axis = 'y';
    }

    if (!this.axis[axis].isOverflowing) {
      return 0;
    }

    var contentSize = this.contentEl[this.axis[axis].scrollSizeAttr];
    var trackSize = this.axis[axis].track.el[this.axis[axis].offsetSizeAttr];
    var scrollbarSize;
    var scrollbarRatio = trackSize / contentSize; // Calculate new height/position of drag handle.

    scrollbarSize = Math.max(~~(scrollbarRatio * trackSize), this.options.scrollbarMinSize);

    if (this.options.scrollbarMaxSize) {
      scrollbarSize = Math.min(scrollbarSize, this.options.scrollbarMaxSize);
    }

    return scrollbarSize;
  };

  _proto.positionScrollbar = function positionScrollbar(axis) {
    if (axis === void 0) {
      axis = 'y';
    }

    if (!this.axis[axis].isOverflowing) {
      return;
    }

    var contentSize = this.contentWrapperEl[this.axis[axis].scrollSizeAttr];
    var trackSize = this.axis[axis].track.el[this.axis[axis].offsetSizeAttr];
    var hostSize = parseInt(this.elStyles[this.axis[axis].sizeAttr], 10);
    var scrollbar = this.axis[axis].scrollbar;
    var scrollOffset = this.contentWrapperEl[this.axis[axis].scrollOffsetAttr];
    scrollOffset = axis === 'x' && this.isRtl && SimpleBar.getRtlHelpers().isRtlScrollingInverted ? -scrollOffset : scrollOffset;
    var scrollPourcent = scrollOffset / (contentSize - hostSize);
    var handleOffset = ~~((trackSize - scrollbar.size) * scrollPourcent);
    handleOffset = axis === 'x' && this.isRtl && SimpleBar.getRtlHelpers().isRtlScrollbarInverted ? handleOffset + (trackSize - scrollbar.size) : handleOffset;
    scrollbar.el.style.transform = axis === 'x' ? "translate3d(" + handleOffset + "px, 0, 0)" : "translate3d(0, " + handleOffset + "px, 0)";
  };

  _proto.toggleTrackVisibility = function toggleTrackVisibility(axis) {
    if (axis === void 0) {
      axis = 'y';
    }

    var track = this.axis[axis].track.el;
    var scrollbar = this.axis[axis].scrollbar.el;

    if (this.axis[axis].isOverflowing || this.axis[axis].forceVisible) {
      track.style.visibility = 'visible';
      this.contentWrapperEl.style[this.axis[axis].overflowAttr] = 'scroll';
    } else {
      track.style.visibility = 'hidden';
      this.contentWrapperEl.style[this.axis[axis].overflowAttr] = 'hidden';
    } // Even if forceVisible is enabled, scrollbar itself should be hidden


    if (this.axis[axis].isOverflowing) {
      scrollbar.style.display = 'block';
    } else {
      scrollbar.style.display = 'none';
    }
  };

  _proto.hideNativeScrollbar = function hideNativeScrollbar() {
    this.offsetEl.style[this.isRtl ? 'left' : 'right'] = this.axis.y.isOverflowing || this.axis.y.forceVisible ? "-" + this.scrollbarWidth + "px" : 0;
    this.offsetEl.style.bottom = this.axis.x.isOverflowing || this.axis.x.forceVisible ? "-" + this.scrollbarWidth + "px" : 0;
  }
  /**
   * On scroll event handling
   */
  ;

  _proto.onMouseMoveForAxis = function onMouseMoveForAxis(axis) {
    if (axis === void 0) {
      axis = 'y';
    }

    this.axis[axis].track.rect = this.axis[axis].track.el.getBoundingClientRect();
    this.axis[axis].scrollbar.rect = this.axis[axis].scrollbar.el.getBoundingClientRect();
    var isWithinScrollbarBoundsX = this.isWithinBounds(this.axis[axis].scrollbar.rect);

    if (isWithinScrollbarBoundsX) {
      this.axis[axis].scrollbar.el.classList.add(this.classNames.hover);
    } else {
      this.axis[axis].scrollbar.el.classList.remove(this.classNames.hover);
    }

    if (this.isWithinBounds(this.axis[axis].track.rect)) {
      this.showScrollbar(axis);
      this.axis[axis].track.el.classList.add(this.classNames.hover);
    } else {
      this.axis[axis].track.el.classList.remove(this.classNames.hover);
    }
  };

  _proto.onMouseLeaveForAxis = function onMouseLeaveForAxis(axis) {
    if (axis === void 0) {
      axis = 'y';
    }

    this.axis[axis].track.el.classList.remove(this.classNames.hover);
    this.axis[axis].scrollbar.el.classList.remove(this.classNames.hover);
  };

  /**
   * Show scrollbar
   */
  _proto.showScrollbar = function showScrollbar(axis) {
    if (axis === void 0) {
      axis = 'y';
    }

    var scrollbar = this.axis[axis].scrollbar.el;

    if (!this.axis[axis].isVisible) {
      scrollbar.classList.add(this.classNames.visible);
      this.axis[axis].isVisible = true;
    }

    if (this.options.autoHide) {
      this.hideScrollbars();
    }
  }
  /**
   * Hide Scrollbar
   */
  ;

  /**
   * on scrollbar handle drag movement starts
   */
  _proto.onDragStart = function onDragStart(e, axis) {
    if (axis === void 0) {
      axis = 'y';
    }

    var elDocument = getElementDocument(this.el);
    var elWindow = getElementWindow(this.el);
    var scrollbar = this.axis[axis].scrollbar; // Measure how far the user's mouse is from the top of the scrollbar drag handle.

    var eventOffset = axis === 'y' ? e.pageY : e.pageX;
    this.axis[axis].dragOffset = eventOffset - scrollbar.rect[this.axis[axis].offsetAttr];
    this.draggedAxis = axis;
    this.el.classList.add(this.classNames.dragging);
    elDocument.addEventListener('mousemove', this.drag, true);
    elDocument.addEventListener('mouseup', this.onEndDrag, true);

    if (this.removePreventClickId === null) {
      elDocument.addEventListener('click', this.preventClick, true);
      elDocument.addEventListener('dblclick', this.preventClick, true);
    } else {
      elWindow.clearTimeout(this.removePreventClickId);
      this.removePreventClickId = null;
    }
  }
  /**
   * Drag scrollbar handle
   */
  ;

  _proto.onTrackClick = function onTrackClick(e, axis) {
    var _this4 = this;

    if (axis === void 0) {
      axis = 'y';
    }

    if (!this.options.clickOnTrack) return;
    var elWindow = getElementWindow(this.el);
    this.axis[axis].scrollbar.rect = this.axis[axis].scrollbar.el.getBoundingClientRect();
    var scrollbar = this.axis[axis].scrollbar;
    var scrollbarOffset = scrollbar.rect[this.axis[axis].offsetAttr];
    var hostSize = parseInt(this.elStyles[this.axis[axis].sizeAttr], 10);
    var scrolled = this.contentWrapperEl[this.axis[axis].scrollOffsetAttr];
    var t = axis === 'y' ? this.mouseY - scrollbarOffset : this.mouseX - scrollbarOffset;
    var dir = t < 0 ? -1 : 1;
    var scrollSize = dir === -1 ? scrolled - hostSize : scrolled + hostSize;
    var speed = 40;

    var scrollTo = function scrollTo() {
      if (dir === -1) {
        if (scrolled > scrollSize) {
          var _this4$contentWrapper;

          scrolled -= speed;

          _this4.contentWrapperEl.scrollTo((_this4$contentWrapper = {}, _this4$contentWrapper[_this4.axis[axis].offsetAttr] = scrolled, _this4$contentWrapper));

          elWindow.requestAnimationFrame(scrollTo);
        }
      } else {
        if (scrolled < scrollSize) {
          var _this4$contentWrapper2;

          scrolled += speed;

          _this4.contentWrapperEl.scrollTo((_this4$contentWrapper2 = {}, _this4$contentWrapper2[_this4.axis[axis].offsetAttr] = scrolled, _this4$contentWrapper2));

          elWindow.requestAnimationFrame(scrollTo);
        }
      }
    };

    scrollTo();
  }
  /**
   * Getter for content element
   */
  ;

  _proto.getContentElement = function getContentElement() {
    return this.contentEl;
  }
  /**
   * Getter for original scrolling element
   */
  ;

  _proto.getScrollElement = function getScrollElement() {
    return this.contentWrapperEl;
  };

  _proto.getScrollbarWidth = function getScrollbarWidth() {
    // Try/catch for FF 56 throwing on undefined computedStyles
    try {
      // Detect browsers supporting CSS scrollbar styling and do not calculate
      if (getComputedStyle(this.contentWrapperEl, '::-webkit-scrollbar').display === 'none' || 'scrollbarWidth' in document.documentElement.style || '-ms-overflow-style' in document.documentElement.style) {
        return 0;
      } else {
        return scrollbarWidth();
      }
    } catch (e) {
      return scrollbarWidth();
    }
  };

  _proto.removeListeners = function removeListeners() {
    var _this5 = this;

    var elWindow = getElementWindow(this.el); // Event listeners

    if (this.options.autoHide) {
      this.el.removeEventListener('mouseenter', this.onMouseEnter);
    }

    ['mousedown', 'click', 'dblclick'].forEach(function (e) {
      _this5.el.removeEventListener(e, _this5.onPointerEvent, true);
    });
    ['touchstart', 'touchend', 'touchmove'].forEach(function (e) {
      _this5.el.removeEventListener(e, _this5.onPointerEvent, {
        capture: true,
        passive: true
      });
    });
    this.el.removeEventListener('mousemove', this.onMouseMove);
    this.el.removeEventListener('mouseleave', this.onMouseLeave);
    this.contentWrapperEl.removeEventListener('scroll', this.onScroll);
    elWindow.removeEventListener('resize', this.onWindowResize);
    this.mutationObserver.disconnect();
    this.resizeObserver.disconnect(); // Cancel all debounced functions

    this.recalculate.cancel();
    this.onMouseMove.cancel();
    this.hideScrollbars.cancel();
    this.onWindowResize.cancel();
  }
  /**
   * UnMount mutation observer and delete SimpleBar instance from DOM element
   */
  ;

  _proto.unMount = function unMount() {
    this.removeListeners();
    SimpleBar.instances.delete(this.el);
  }
  /**
   * Check if mouse is within bounds
   */
  ;

  _proto.isWithinBounds = function isWithinBounds(bbox) {
    return this.mouseX >= bbox.left && this.mouseX <= bbox.left + bbox.width && this.mouseY >= bbox.top && this.mouseY <= bbox.top + bbox.height;
  }
  /**
   * Find element children matches query
   */
  ;

  _proto.findChild = function findChild(el, query) {
    var matches = el.matches || el.webkitMatchesSelector || el.mozMatchesSelector || el.msMatchesSelector;
    return Array.prototype.filter.call(el.children, function (child) {
      return matches.call(child, query);
    })[0];
  };

  return SimpleBar;
}();

SimpleBar.defaultOptions = {
  autoHide: true,
  forceVisible: false,
  clickOnTrack: true,
  classNames: {
    contentEl: 'simplebar-content',
    contentWrapper: 'simplebar-content-wrapper',
    offset: 'simplebar-offset',
    mask: 'simplebar-mask',
    wrapper: 'simplebar-wrapper',
    placeholder: 'simplebar-placeholder',
    scrollbar: 'simplebar-scrollbar',
    track: 'simplebar-track',
    heightAutoObserverWrapperEl: 'simplebar-height-auto-observer-wrapper',
    heightAutoObserverEl: 'simplebar-height-auto-observer',
    visible: 'simplebar-visible',
    horizontal: 'simplebar-horizontal',
    vertical: 'simplebar-vertical',
    hover: 'simplebar-hover',
    dragging: 'simplebar-dragging'
  },
  scrollbarMinSize: 25,
  scrollbarMaxSize: 0,
  timeout: 1000
};
SimpleBar.instances = new WeakMap();

export default SimpleBar;
//# sourceMappingURL=simplebar-core.esm.js.map